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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 50073:1999 Incorpor
2、ating Corrigendum No. 1 The European Standard EN 50073:1999 has the status of a British Standard ICS 13.320; 29.260.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Guide for selection, installation, use and maintenance of apparatus for the detection and measurement of combu
3、stible gases or oxygen Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:20:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and
4、 comes into effect on 15 September 1999 BSI 06-2001 ISBN 0 580 32803 1 BS EN 50073:1999 Amendments issued since publication Amd. No.DateComments 13167 Corrigendum No.1 June 2001Changes to national foreword National foreword This British Standard is the English language version of EN 50073:1999. It s
5、upersedes BS 6959:1989 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEL/31, Electrical apparatus for use in explosive atmospheres, to Subcommittee GEL/31/19, Gas detectors, which has the responsibility to: aid enquirers to understand the text; pres
6、ent to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained
7、on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility o
8、f the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
9、 Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 24, an inside back cover and a back cover. The BSI copyright notice displayed throughout this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na
10、, Mon Nov 06 03:20:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CENELEC European Committee for Electrotechnical Standardization Comite Europe en de Normalisation Electrotechnical Europa isches Komitee fu r Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1999 CENEL
11、EC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50073:1999 E EUROPEAN STANDARDEN 50073 NORME EUROPE ENNE EUROPA ISCHE NORM April 1999 ICS 13.200; 19.080 English version Guide for selection, installation, use and maintenance of apparatus
12、for the detection and measurement of combustible gases or oxygen Guide de se lection, dinstallation, dutilisation et de maintenance des appareils de de tection et de mesure de gaz combustible ou doxyge ne Leitfaden fu r Auswahl, Installation, Einsatz und Wartung von Gera ten fu r das Aufspu ren und
13、die Messung brennbarer Gase oder von Sauerstoff This European Standard was approved by CENELEC on 1998-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any a
14、lteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made b
15、y translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany,
16、Greece, Iceland, Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:20:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 50073:1999 BSI 06-2001 Foreword This European Standard was prepared
17、 by SC 31-9, Electrical apparatus for the detection and measurement of combustible gases to be used in industrial and commercial potentially explosive atmospheres, of Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres. The text of the draft was submitted to the formal
18、vote and was approved by CENELEC as EN 50073 on 1998-10-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1999-10-01 latest date by which the national standards conflicting w
19、ith the EN have to be withdrawn(dow) 1999-10-01 Contents Page Foreword2 1Scope3 2Normative references3 3Definitions4 4Intended application6 4.1General6 4.2Performance testing7 4.3Electrical testing and certification for use of apparatus in potentially explosive atmospheres7 4.4Fixed apparatus and fi
20、xed systems7 4.5Transportable apparatus7 4.6Portable apparatus7 4.7Sampling lines and sampling probes7 4.8Filters8 4.9Flame arrestors8 5Criteria of selection8 5.1General8 5.2Catalytic sensor8 5.3Thermal conductivity sensor9 5.4Infrared sensor10 5.5Semiconductor sensor10 5.6Electrochemical sensor11 P
21、age 5.7Flame ionization detector (FID)11 5.8Flame temperature analyser (FTA)12 5.9Photo ionization detector (PID)12 5.10 Paramagnetic oxygen detector12 6Operation of fixed gas detection systems13 6.1General13 6.2Installation13 6.3Criteria for the placement of sensors and sampling points13 6.4Operati
22、on14 7Operation of portable and transportable gas detection apparatus15 7.1General15 7.2Operation16 8Training17 8.1Operator training17 8.2Maintenance training17 Annex A (informative) Physical and chemical principles of sensors18 A.1Catalytic sensors (see 5.2)18 A.2Thermal conductivity sensors (see 5
23、.3)18 A.3Infrared absorption sensors (see 5.4)18 A.4Semiconductor sensors (see 5.5)19 A.5Electrochemical sensor (see 5.6)19 A.6Flame ionization detectors (FID) (see 5.7)19 A.7Flame temperature analyser (FTA) (see 5.8)20 A.8Photo ionization detector (PID) (see 5.9)20 A.9Paramagnetic oxygen detector (
24、see 5.10)20 Annex B (informative) Nature of a release21 B.1General21 B.2Parameters influencing the release21 B.3Outdoor sites and open structures22 B.4Buildings and enclosures22 Annex C (informative) Measuring ranges up to LEL23 C.1Reference to the annex of EN 5005423 Annex D (informative) Environme
25、ntal parameters24 D.1Typical environmental conditions used in type testing24 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:20:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 50073:1999 BSI 06-2001 1) Group II apparatus are suitable for places with potentially explosive atmosphere
26、s, other than mines susceptible to firedamp, see 4.3. 2) For the purpose of this guide, toxic covers toxic, very toxic and harmful gases and vapours. 1 Scope This document gives guidance on the selection, installation, use and maintenance of electrically operated Group II1)apparatus intended for use
27、 in industrial and commercial safety applications for the detection and measurement of: combustible gases, as described in EN 50054, EN 50057, EN 50058; or oxygen as described in EN 50104. This guide is a compilation of practical knowledge to assist the user. Combustible gas detection apparatus, fix
28、ed, transportable or portable, may be used whenever there is the possibility of a risk to life or property caused by the accumulation of a combustible gas-air mixture. Such apparatus can provide a means of reducing the risk by detecting the presence of the combustible gas and issuing suitable audibl
29、e or visual warnings. It may also be used to initiate specific safety precautions (e.g. plant shutdown, evacuation, operation of fire extinguishing procedures). It is applicable to all new permanent installations and, where reasonably practicable, to existing permanent installations. It is also appl
30、icable to temporary installations, whether new or existing. This guide is not intended, but may provide useful information, for the following: apparatus intended for the measurement of oxygen deficiency which may affect human health; apparatus intended only for the detection of non-combustible toxic
31、2)gases; apparatus of laboratory or scientific type intended only for analysis or measurement purposes; apparatus intended for underground mining applications; apparatus intended only for process control applications. This guide does not apply to the following: apparatus for the detection of explosi
32、ves; apparatus intended for the detection of a potentially combustible atmosphere resulting from dust or mist in air; open path apparatus not used for point measurement. 2 Nornative references This European Standard incorporates by dated or undated references, provisions from other publications. The
33、se normative references are cited at the appropriate place in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undate
34、d references the latest edition of the publication referred to applies. EN 50014:1997, Electrical apparatus for potentially explosive atmospheres General requirements. EN 50015:1998, Electrical apparatus for potentially explosive atmospheres Oil immersion o. EN 50016:1995, Electrical apparatus for p
35、otentially explosive atmospheres Pressurized apparatus p. EN 50017:1998, Electrical apparatus for potentially explosive atmospheres Powder filling q. EN 50018:1994, Electrical apparatus for potentially explosive atmospheres Flameproof enclosure d. EN 50019:1994, Electrical apparatus for potentially
36、explosive atmospheres Increased safety e. EN 50020:1994, Electrical apparatus for potentially explosive atmospheres Intrinsic safety i. EN 50028:1987, Electrical apparatus for potentially explosive atmospheres Encapsulation m. EN 50039:1980, Electrical apparatus for potentially explosive atmospheres
37、 Intrinsically safe electrical systems i. EN 50054:1998, Electrical apparatus for the detection and measurement of combustible gases General requirements and test methods. EN 50057:1998, Electrical apparatus for the detection and measurement of combustible gases Performance requirements for Group II
38、 apparatus indicating up to 100 % lower explosive limit. EN 50058:1998, Electrical apparatus for the detection and measurement of combustible gases Performance requirement for Group II apparatus indicating up to 100 % (V/V) gas. EN 50104:1998, Electrical apparatus for the detection and measurement o
39、f oxygen Performance requirements and test methods. EN 60079-10:1996, Electrical apparatus for potentially explosive atmospheres Part 10: Classification of hazardous areas. IEC 60079-20, Electrical apparatus for explosive gas atmospheres Part 20: Data for flammable gases and vapours, relating to the
40、 use of electrical apparatus. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:20:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 50073:1999 BSI 06-2001 3 Definitions For the purpose of this standard the following definitions apply. 3.1 type of explosion protection the measures appl
41、ied in the construction of electrical apparatus to prevent ignition of a surrounding explosive atmosphere by such apparatus (see 4.3) 3.2 lower explosion limit (LEL) the volume ratio of combustible gas or vapour in air below which an explosive gas atmosphere will not be formed 3.3 upper explosion li
42、mit (UEL) the volume ratio of combustible gas or vapour in air above which an explosive gas atmosphere will not be formed 3.4 explosive gas atmosphere a mixture with air, under normal atmospheric conditions, of combustible gases or vapours, in which, after ignition, combustion spreads throughout the
43、 unconsumed mixture 3.5 Group II apparatus electrical apparatus for places with a potentially explosive atmosphere, other than mines susceptible to firedamp (see 4.3) 3.6 firedamp a combustible gas, consisting mainly of methane, found naturally in mines 3.7 fixed apparatus an apparatus which is inte
44、nded to have all its parts permanently installed 3.8 transportable apparatus an apparatus not intended to be portable, but which can be readily moved from one place to another 3.9 portable apparatus spot reading or continuously sensing apparatus designed to be readily carried from place to place and
45、 to be used whilst being carried. Portable apparatus with integral or separate battery includes, but is not limited to: hand-held apparatus, typically less than 1 kg, suitable for single-handed operation; personal monitors, similar in size and mass to the hand-held apparatus, that are continuously o
46、perating (but not necessarily continuously sensing) whilst attached to the user; and larger apparatus up to 5 kg that can be operated by the user whilst suspended by hand, by a shoulder strap or by a carrying harness; it may or may not have a hand directed probe. 3.10 spot reading apparatus an appar
47、atus intended to be used for short periods of time as required 3.11 continuous duty apparatus apparatus which is continuously powered but may have continuous or intermittent sensing 3.12 sensor an assembly in which the sensing element is housed that may contain associated circuit components 3.13 sen
48、sing element that part of a sensor that reacts in the presence of a combustible gas mixture to produce some physical or chemical change that can be used to activate a measuring or alarm function, or both 3.14 catalytic sensor a sensor, the operation of which depends upon the oxidation of gases on an
49、 electrically heated catalytic element (see A.1) 3.15 thermal conductivity sensor a sensor, the operation of which depends upon the change of heat lost by conduction of an electrically heated element located in the gas to be measured, compared with that of a similar element located in reference gas cell (see A.2) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:20:32 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 50073:1999 BSI 06-2001 3.16 infra-red sensor